#ifndef __DECODED_BIT_STREAM_PARSER_DM_H__
#define __DECODED_BIT_STREAM_PARSER_DM_H__

/*
 *  DecodedBitStreamParser.h
 *  zxing
 *
 *  Created by Luiz Silva on 09/02/2010.
 *  Copyright 2010 ZXing authors All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <string>
#include <sstream>
#include <zxing/common/Array.h>
#include <zxing/common/BitSource.h>
#include <zxing/common/Counted.h>
#include <zxing/common/DecoderResult.h>


namespace zxing {
    namespace datamatrix {

        class DecodedBitStreamParser {
        private:
            static const int PAD_ENCODE = 0;  // Not really an encoding
            static const int ASCII_ENCODE = 1;
            static const int C40_ENCODE = 2;
            static const int TEXT_ENCODE = 3;
            static const int ANSIX12_ENCODE = 4;
            static const int EDIFACT_ENCODE = 5;
            static const int BASE256_ENCODE = 6;

            /**
             * See ISO 16022:2006, Annex C Table C.1
             * The C40 Basic Character Set (*'s used for placeholders for the shift values)
             */
            static const char C40_BASIC_SET_CHARS[];

            static const char C40_SHIFT2_SET_CHARS[];
            /**
             * See ISO 16022:2006, Annex C Table C.2
             * The Text Basic Character Set (*'s used for placeholders for the shift values)
             */
            static const char TEXT_BASIC_SET_CHARS[];

            static const char TEXT_SHIFT3_SET_CHARS[];

            /**
             * See ISO 16022:2006, 5.2.3 and Annex C, Table C.2
             */
            int decodeAsciiSegment(Ref<BitSource> bits, std::ostringstream &result,
                                   std::ostringstream &resultTrailer);

            /**
             * See ISO 16022:2006, 5.2.5 and Annex C, Table C.1
             */
            void decodeC40Segment(Ref<BitSource> bits, std::ostringstream &result);

            /**
             * See ISO 16022:2006, 5.2.6 and Annex C, Table C.2
             */
            void decodeTextSegment(Ref<BitSource> bits, std::ostringstream &result);

            /**
             * See ISO 16022:2006, 5.2.7
             */
            void decodeAnsiX12Segment(Ref<BitSource> bits, std::ostringstream &result);

            /**
             * See ISO 16022:2006, 5.2.8 and Annex C Table C.3
             */
            void decodeEdifactSegment(Ref<BitSource> bits, std::ostringstream &result);

            /**
             * See ISO 16022:2006, 5.2.9 and Annex B, B.2
             */
            void decodeBase256Segment(Ref<BitSource> bits, std::ostringstream &result,
                                      std::vector<char> byteSegments);

            void parseTwoBytes(int firstByte, int secondByte, int *result);

            /**
             * See ISO 16022:2006, Annex B, B.2
             */
            char unrandomize255State(int randomizedBase256Codeword,
                                     int base256CodewordPosition) {
                int pseudoRandomNumber = ((149 * base256CodewordPosition) % 255) + 1;
                int tempVariable = randomizedBase256Codeword - pseudoRandomNumber;
                return (char) (tempVariable >= 0 ? tempVariable : (tempVariable + 256));
            };

            void append(std::ostream &ost, const char *bufIn, size_t nIn, const char *src);

        public:
            DecodedBitStreamParser() { };

            Ref<DecoderResult> decode(ArrayRef<char> bytes);
        };

    }
}

#endif // __DECODED_BIT_STREAM_PARSER_DM_H__
